/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

NOTE: This source is derived from an old version taken from the GNU C
Library (glibc).

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
   (which it would do because it found this file in $srcdir).  */
#include <config.h>
#else
#include "config.h"
#endif
#endif

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

/* This code to undef const added in libiberty.  */
#ifndef __STDC__
/* This is a separate conditional since some stdc systems
   reject `defined (const)'.  */
#ifndef const
#define const
#endif
#endif

#include "fnmatch.h"

#include <ctype.h>

   /* Comment out all this code if we are using the GNU C Library, and are not
      actually compiling the library itself.  This code is part of the GNU C
      Library, but also included in many other GNU distributions.  Compiling
      and linking in this code is a waste when using the GNU C library
      (especially if it is a shared library).  Rather than having every GNU
      program understand `configure --with-gnu-libc' and omit the object files,
      it is simpler to just do this in the source for each such file.  */

#if defined (_LIBC) || !defined (__GNU_LIBRARY__)


#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
extern int errno;
#endif

/* Match STRING against the filename pattern PATTERN, returning zero if
   it matches, nonzero if not.  */
int
fnmatch(const char* pattern, const char* string, int flags)
{
    register const char* p = pattern, * n = string;
    register unsigned char c;

#define FOLD(c)	((flags & FNM_CASEFOLD) ? tolower (c) : (c))

    while ((c = *p++) != '\0')
    {
        c = FOLD(c);

        switch (c)
        {
        case '?':
            if (*n == '\0')
                return FNM_NOMATCH;
            else if ((flags & FNM_FILE_NAME) && *n == '/')
                return FNM_NOMATCH;
            else if ((flags & FNM_PERIOD) && *n == '.' &&
                (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
                return FNM_NOMATCH;
            break;

        case '\\':
            if (!(flags & FNM_NOESCAPE))
            {
                c = *p++;
                c = FOLD(c);
            }
            if (FOLD((unsigned char)*n) != c)
                return FNM_NOMATCH;
            break;

        case '*':
            if ((flags & FNM_PERIOD) && *n == '.' &&
                (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
                return FNM_NOMATCH;

            for (c = *p++; c == '?' || c == '*'; c = *p++, ++n)
                if (((flags & FNM_FILE_NAME) && *n == '/') ||
                    (c == '?' && *n == '\0'))
                    return FNM_NOMATCH;

            if (c == '\0')
                return 0;

            {
                unsigned char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
                c1 = FOLD(c1);
                for (--p; *n != '\0'; ++n)
                    if ((c == '[' || FOLD((unsigned char)*n) == c1) &&
                        fnmatch(p, n, flags & ~FNM_PERIOD) == 0)
                        return 0;
                return FNM_NOMATCH;
            }

        case '[':
        {
            /* Nonzero if the sense of the character class is inverted.  */
            register int negate;

            if (*n == '\0')
                return FNM_NOMATCH;

            if ((flags & FNM_PERIOD) && *n == '.' &&
                (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
                return FNM_NOMATCH;

            negate = (*p == '!' || *p == '^');
            if (negate)
                ++p;

            c = *p++;
            for (;;)
            {
                register unsigned char cstart = c, cend = c;

                if (!(flags & FNM_NOESCAPE) && c == '\\')
                    cstart = cend = *p++;

                cstart = cend = FOLD(cstart);

                if (c == '\0')
                    /* [ (unterminated) loses.  */
                    return FNM_NOMATCH;

                c = *p++;
                c = FOLD(c);

                if ((flags & FNM_FILE_NAME) && c == '/')
                    /* [/] can never match.  */
                    return FNM_NOMATCH;

                if (c == '-' && *p != ']')
                {
                    cend = *p++;
                    if (!(flags & FNM_NOESCAPE) && cend == '\\')
                        cend = *p++;
                    if (cend == '\0')
                        return FNM_NOMATCH;
                    cend = FOLD(cend);

                    c = *p++;
                }

                if (FOLD((unsigned char)*n) >= cstart
                    && FOLD((unsigned char)*n) <= cend)
                    goto matched;

                if (c == ']')
                    break;
            }
            if (!negate)
                return FNM_NOMATCH;
            break;

        matched:;
            /* Skip the rest of the [...] that already matched.  */
            while (c != ']')
            {
                if (c == '\0')
                    /* [... (unterminated) loses.  */
                    return FNM_NOMATCH;

                c = *p++;
                if (!(flags & FNM_NOESCAPE) && c == '\\')
                    /* XXX 1003.2d11 is unclear if this is right.  */
                    ++p;
            }
            if (negate)
                return FNM_NOMATCH;
        }
        break;

        default:
            if (c != FOLD((unsigned char)*n))
                return FNM_NOMATCH;
        }

        ++n;
    }

    if (*n == '\0')
        return 0;

    if ((flags & FNM_LEADING_DIR) && *n == '/')
        /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
        return 0;

    return FNM_NOMATCH;
}

#endif	/* _LIBC or not __GNU_LIBRARY__.  */
